package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional// 开启事务
    public void saveWithFlavor(DishDTO dishDTO) {
        //向菜品表插入一条数据
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //保存菜品数据
        dishMapper.save(dish);
        //使用mybatis返回来的id为菜品id赋值，这一步不要忘记了
        Long dishId = dish.getId();//保存完之后原先的id值被清空了，这里也是个小细节
        //向菜品口味数据插入多条数据
        //1. 获取菜品口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        //2. 判断菜品口味是否为空，不为空，进行数据保存
        if(flavors != null && flavors.size() > 0){
            //设置菜品id
            for (DishFlavor dishFlavor : flavors) {
                dishFlavor.setDishId(dishId);
            }
            dishFlavorMapper.saveDishFlavorBatch(flavors);
        }

    }

    /**
    *菜品分页查询
    */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //1. pagehelper分页，第一个参数是当前页，第二个参数是每页显示多少条数据
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        //2. 执行分页查询
        //这里得是DishVO,这是对数据库返回的结果的封装用得是VO类，不是Dish
        List<DishVO> dishList = dishMapper.findAll(dishPageQueryDTO);//pagehelper底层会自动拼接sql语句，进行分页查询
        Page<DishVO> dishVoPage = (Page<DishVO>) dishList;//获取分页结果
        //3. 封装结果并返回
        return new PageResult(dishVoPage.getTotal(),dishVoPage.getResult());
    }

    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Transactional//事务
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);//后绪步骤实现
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);//后绪步骤实现
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);//后绪步骤实现
        }
    }

    /**
     * 修改菜品
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        //执行更新口味数据最简单的方式就是先删除菜品，再添加
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            for (DishFlavor dishFlavor : flavors) {
                dishFlavor.setDishId(dishDTO.getId());
            }
            dishFlavorMapper.saveDishFlavorBatch(flavors);
        }
    }

    /**
     * 根据id查询菜品基本信息以及口味信息
     */
    public DishVO getByIdWithFlavor(Long id) {
        DishVO dishVO = new DishVO();
        Dish dish = dishMapper.getByIdWithFlavor(id);
        List<DishFlavor> flavors = dishFlavorMapper.getById(id);
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);//查询菜品基本信息

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 菜品起售停售
     */
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品基本信息
     */
    public List<Dish> list(Dish dish) {
        List<Dish> list = dishMapper.list(dish);
        return list;
    }
}
